Re: [CAD_CAM_EDM_DRO] Re: why not just change the motor?

jlsmith269 wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Brian" <ka1bbg@w...> wrote:
>
>
>>Hi, sometimes a 3 phase motor is rewound for single phase, but very
>>expensive, many motors cannot be changed. a 1-200 dollar
>>
>>
>inverter/vfd/static
>
>
>>is cheap by 800 dollars..over a rewind job..cul brian f.
>>
>>
>
>okay, so IF it could be rewound for 800 (i think that's high, it's
>cheaper in houston, but they have about 50 rewind shops about here)
>that would elimenate VFD noise, RSC (rotary static converter) issues,
>and some shielding issues with PC based control systems..
>
>on "as strong".. that part I don't see, as many low HP (3 and under)
>machines are offered to be able to be wired either way, or am I just
>reading the marketing materials wrong?
>
>
>

You may be able to order the same machine with EITHER a 3-phase or
single-phase motor. 120/240 V motors are no big deal, but there is no
such thing as a single-phase/3-phase motor, just by switching a few
wires in the junction panel.

>Or, heck, let's get to the heart of the issue, if *I* bought a 2 hp
>boss 8 cnc, 3ph, I would NOT bother with a vfd on it.. i would get the
>wiring and motor from a 2 hp 220 1ph , and bolt it on... and yeah, I
>would spend DOUBLE or more for that simple solution, rather than
>kludge it, knowing I am introducing unknowns into a pc-cnc/enc setup.
>
>

Well, everybody has their own way of kicking themselves in the rear, but
having used a VFD on 2 machines (lathe and mill) I would never want to
go back to other methods. The VFD has SO many benefits!

Jon